If a current 1=15 A is distributed uniformly over the conical surface of angle 0=60° as shown below, the value of the surface current density K at (r=4,0%360°,p%330°) is a. 0.69 A/m Ob.4.13 A/m Oc 2.76 A/m O d.0.52 A/m e. 6.20 A/m
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